Computer for multiple ballistics



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COMPUTER FOR MULTIPLE BALLISTICS By E. LAKATOS A7' TORNE Y Patented Feb. 23, 1954 COMPUTER FOR MULTIPLE BALLISTICS Emory Lakatos, Summit, N. J., assignor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application December 29, 1944, Serial No. 570,284

37 Claims. (C1. 23S-61.5)

This invention relates to apparatus for the control of artillery fire, and particularly to electromechanical artillery computers.

The object of the invention is an apparatus which may be adjusted to produce, at will, physical quantities, such as voltages, varying in magnitude with the variations in the multiple ballistic eiects of a plurality of ballistic conditions, such as the caliber of the weapon, the type of shell, or the amount of the propellant.

A feature of the invention is means for computing the multiple ballistic effects due to a given set of ballistic conditions in relation to the ballistic elevation angle of the weapon, that is, the angle to which the weapon would have to be elevated to cause the projectile to travel a distance in the horizontal plane through the Weapon equal to the predicted range of the target.

Another feature of the invention is a plurality of electrical networks, each including an element adjusted proportionally to the ballistic elevation angle of the weapon, the rate of change with ballistic elevation of the resistance of said element being less than the rate of change of the ballistic effect, associated with a plurality of resistors so proportioned that each network, with its associated element, will produce a voltage varying in magnitude proportionally to a ballistic effect of one of the ballistic conditions.

Another feature of the invention is an adjustable element associated with the ballistic networks to supply voltages proportional to the ballistic eiect of the wind, the ballistic eiect of the rotation of the earth, and the eiect of the parallax of a second gun with respect to a pivot gun.

In prior electromechanical artillery computers, ballistic corrections were made only for one type of weapon and ammunition, and on the assumption that conditions, which may be larger or smaller than normal, will vary symmetrically above and below normal. Thus, an element ofA the computer was shaped to produce a physical quantity which varied with the particular ballistic effect. With larger weapons of longer range than previously used, it has been found that the assumption of symmetrical variation of the ballistic effects, above and below the normal value is not suiciently accurate. Also, in the present computer, the ballistic effects are determined for a plurality of ballistic conditions, such as a large weapon, using two or more types of shells or propellants and a small Weapon of limited range.

In accordance with the prior practice, ve shaped elements would be required for each ballistic effect, that is, two elements for plus and minus values of the eiect for one set of ballistic conditions, such as the type of shell or propellant; two elements for plus and minus values of the same effect for another set of ballistic conditions, and one element for all values of the effect for the smaller weapon.

In the present computer, one shaped element is so associated with any one of five associated networks, that, for a given adjustment of the element, the combination selected will have an output proportional to a desired ballistic eiiect.

In prior computers, the quantities representing the effects due to wind, earth rotation and gun parallax were independently produced for each ballistic condition. In the present computer, a single adjustable element produces quantities from which may be derived the quantities proportional to all these effects for all the ballistic conditions.

In the drawings:

Fig. 1 schematically shows a system for transmitting data from the observing stations to the computer;

Fig. 2 schematically shows a system for generating voltages proportional to the coordinates of the present position of the target;

Fig. 3 schematically shows a system for synthetically generating voltages proportional to the coordinates of the present position of the target, or voltages proportional to the rates of change in said coordinates;

Fig. 4 schematically shows a system for indicating the present position of the target with respect to the gun, for generating voltages proportional to the rates of change in the coordinates, and voltages proportional to the coordinates of the predicted position of the target;

Fig. 5 schematically shows a system for indicating the azimuths and quadrant elevations of two guns, generating a voltage proportional to the range of the second gun, and generating voltages proportional to the maximum effects of the wind;

Fig. 6 schematically shows a system for indicating the deflection angle of a rst gun, for generating voltages proportional to the range of the first gun, and for indicating the ballistic elevation angle of a second gun;

Figs. 7 and 8 schematically show a system for indicating the ballistic elevation angle of a first gun;

Figs. 9 and 10- show, in elevation and plan, the 

